/Engine/Source/Runtime/Engine/Classes/Materials/MaterialInstance.h
Override a specific texture (transient)
virtual void OverrideTexture ( const [UTexture](API\Runtime\Engine\Engine\UTexture) * InTextureToOverride, [UTexture](API\Runtime\Engine\Engine\UTexture) * OverrideTexture, [ERHIFeatureLevel::Type](API\Runtime\RHI\ERHIFeatureLevel__Type) InFeatureLevel )